Frequencies for sourcename variable in busrules2015 dataset :

Source Name |      Freq.     Percent        Cum.
------------+-----------------------------------
       HIOS |      6,183       61.25       61.25
        OPM |        140        1.39       62.63
      SERFF |      3,772       37.37      100.00
------------+-----------------------------------
      Total |     10,095      100.00

by Jean Roth , jroth@nber.org , 9 Dec 2017